Travel control actuating apparatus



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March 20, 1945. E. RocKwl-:LL I 2,37214 TRAVEL CONTROL ACTATING APPARATUS 'I Filed June 13, 1941 5 Sheets-Sheet 2 l INVETR Edwmz A Rac/cwe ATTORNEY March 20, 1945. E. A.RocKwE| L TRAVEL CONTROL ACTUATING API ARATUS l Filed June' 13, 1941 5' sheets-sheei 5 INVENTOR 5 ATTORNEY March 2o, 194s.

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Q TRAVEL CONTROL ACTUATING APPARATUSy Filed June 1s, 1941, 5 sheets-sheet 5 LIV@ INVENTOR 'dward L. Rockwell Patented Mar; 20, 1945' UNITED ySTATES PATENT. OFFICE TRAVEL CONTROL ACTUATING APPARATUS Edward A. Rockwell, West Hartford, Conn. Applicadn June r3; 1941,1sria1 Noi-:397,896

' is'olaims. (ci. fao-54.5)

My invention relates particularly to an apparatus designed for actuating the movement of any desired part in such a way as to coordinate the travel of said part lwith the travel of the means which actuates the same, the same being accomplished by the interposition of a uid, as for example hydraulic liquid. v

The object of my invention is to provide an apparatus of the above character whereby part-s to be moved may be effectively operated through the agency of a uid while coordinating the travel of the part to be moved with the means forv moving the same. A further object is to accomplish this by applying any desired modulated pressure at any point in the said movement. Still another object is to accomplish the same by `the utilization of a vacuum. One ofthe objects, furthermore, is to apply the travel control mechanism to the operation of air brake systems, that is to say air brakes -operated by the application of compressed air. Further objects of my invention will appear from the detailed description of the same hereinafter. f

While my invention is capable of embodiment in many diiierent forms for the purpose of illustration' I have shown only certain forms in the accompanying drawings, in which- Fig. l is a diagrammatic representation of the application of my system for the operation of two alternately operable brakes, as for example on the Winches of a hoisting engine;

Fig. 2 is an end elevation of one of the power units;

Fig. 3 is. a vertical section thereof taken on line 3 3 of Fig. 2;

Fig. 4 is a plan view taken partially in crosssection on line 4-4 of Fig. 2; l

Fig. 5 is an elevation of the other end of said power unit;

Fig. 6 is a' vertical section of a modified form of a device to be moved by mysystem, in which a mechanical connection is provided therefrom to any desired part to be moved;

Fig. 7 is a diagrammatic vertical section show- 'ing a travel controlled air brake system operated In the drawings, referring frs't to Fig. 1, I have shown a manual actuating lever I carried on a.

pivot 2 located in any suitable support 3. 'I'he lower end of the lever I is provided with a rounded portion 4 for operating alternately, as desired, a piston rod 5 or a piston rod 6 leading t the actuationLrespectively, of a brake-band vI on one hoisting engine winch or anotherbrakeband 8 on another winch on the hoisting eny gine. The parts connecting the piston rod and the brake-band I are the same as the parts convmay be mounted on any desired support by means of three screw holes- Illa. This master cylinder,

accordingly, may contain a piston I I connected to `the piston rod 5 and operating in a cylinder I2 lled with a hydraulic liquid received from the upper-or supply part of the master cylinder Ill. The hydraulic liquid thus placed under manual pressure 'by the lever I is conveyed by a flexible pipe I3 to an inlet. opening I4 in a pipe tting inde 24 having two pistons 25 and 26 returned I5 screw-threaded into an end casting I6 and sealed therein by an 'annular rubber seal -II. Initially, .this liquid under manual pressure will pass from the inlet opening I4 by a valve seat I8 on the inner end o f the fitting I5 and a conical valve I9 seating thereon through utings 20 which act as guides for a guide member 2l and thence through an outlet port 22. in said casting I6 to a...exible pipe 23 which leads toa brake cylby springs 21 and 28 respectively. The pistons 25 and 26 are'connected, respectively, to U-shaped ends 29 and 30 of the brake-band 8, having brake linings 3I and 32 and having a pivot bracket 33 secured to said band which has a slot 34 containing a pivot pin 35 secured to any desired stationary part of the winch. The liquid thus sup- 'l plied manually tothe brake cylinder 24 will move the brake-band 8 up into position .without placing very much pressure on the brake drum (not shown) within the same. At the same time the liquid. under manual pressure will pass by a passageway 36 and through a iitting 31 to a pipe 38 which extends longitudinally in a sheet metal power unit housing 39 which is attached to the casting I3 by screws 4Il. Adjacent to the casting I6 the housing 39 has therein a valve casing 4IA containing a check valve 42 cooperating with a valve seat 43 in said casing 4|. Said casing 4| is connected by a iiexible pipe 44' to an engine manifold 45 on an internal combustion engine for driving two Winches (not shown) on which the two brakes are located, or it may be connected to any other suitable source of vacuum. The housing 39 is designed to be supported on any desired fixed support by means of two straps 46 and 41 having supporting ends 48 and 49 for suitable attachment; thereto, said straps 46 and 41 being tightened on the housing by means of bolts 58 with intervening sleeves 5|.

The liquid underl manual pressure is thus conveyed through the pipe 36, into a casting 52 and thence through a fitting 53 and a pipe 54 to a fitting 55 in a plunger housing 56 which is secured by screws 51 to the casting 52. The liquid under manual pressure is thence conveyed into a plunger chamber 58 having an annular rubber seal 58a and a plunger 59 therein carrying on the interior of the plunger a graphite bronze bushing 68 on which there is secured tightly a dished outlet valve 6|. 62 is carried between the annular plunger 59 and bushing 68 and the dished Valve 6I. The said bushing 68 is provided so as to produce a slidable t on a monitor plunger 63 whichextends out through an opening 64 in the plunger housing 56 with an appreciable clearance between the plunger 63 and the plunger housing 56. IThe said plunger 63 extends, furthermore, into a cylindrical chamber 65 in a tube 66 screw-threaded to the housing 56 on which it is held by a lock-nut 61. The other end of the tube 86 is closed by a plug 68 which has an air relief passageway 69 to communicate with ascrew plug 18 having a transverse passageway 1| leading to a longitudi- An annular rubber seal nal passageway 12 which is adapted to be closed normally by a removable screw plug 13. By the removal of the plug 13 the accumulated air may be allowed -to escape from time to time.-

The outlet valve 6| is located in a vacuum chamber 14 in the casting 52, which communicates by a passageway 15 in the casting 52 leading to a port 16 so as to communicate with the interior of the housing 39 by passing through an end ring 11 secured to the end of the housing 39 by screws 11a. A spider 18 is .secured by screws' 19 to the right face of the casting 52 and so as to hold in place a comparatively then oxidized oil silk diaphragm 80, the inner periphery of which is clamped between a clamping plate 8| and a dished inlet valve 82. The clamp-4 ing plate 8| and inlet valve 82 are mounted together'on a spacing member-83, having radial passageways 84, which in turn is mounted on a retainer plate 85, these parts being4 connected together by a series of rivets 86. Between the spacing member 83 and .the retainer plate 85 there is a diaphragm 81 which acts as a valve seat for both said valves 62 and 82. The clamping plate 8| has radial passageways 89. The retainer member 85 acts as a support for one end -of a large spring 98, the other end of the spring a gauze disc 94 and communicating in turn with a chamber 95 filled with horsehair, within a cover 96 which is in communication with the outer air around its edge 91 owing to the fact that it is supported upon fingers 98 on the casting 52. This cover 96 is held in place beneath the tube 66 by the nut 61. Passing through the chamber 95 at one point there is an extension 99 on the casting 52 to provide a passageway |88 which extends through the spider I18 into the interior of the housing 39 so as to provide a modied vacuum, if desired, for any other purpose and as an ,opening for the insertion of a lubricant. This is normally closed by a screw plug |8|.

Within the housing 39 and resting against the .casting 52 there is a cylinder |82 closed at one the bolts being connected together Yby an 4end ring |81. .When the manual pressurehas Vaccumulated suiiciently to move the plunger 59 the' outlet valve 62 will become seated on the diaphragm and then push the inlet valve 82 oi its seat to admit the atmospheric air through the spider 18 which, as a result, forces to the right a piston |88, which is mounted on the plunger 63, against a shoulder |89 on said plunger where itis clamped in place by a hollow piston rod ||8. The said piston has on one face thereof a thin plate for holding in place a leather piston ring ||2 which is kept in contact with the cylinder |82 by a spring ring ||3 of any desired shape. The other face of the piston |88 carries a retainer plate ||4 for holding in place a felt washer H5. The said piston |08 is normally forced to the left by means of a coil spring ||6, the other end of which is supported on the cap |83. The holrod ||8is-connected to the valve member 2|.

being arranged to seat on the spider 18. Within Y the spring 98 there is a small spring 9| for normally keeping the valve 62 open and which bears against one end of the bushing 68, the other end previously described herein.

may be connected by ears |21 to any suitable casting 52 which leads to a port 93 covered with Il Furthermore, the said end of the piston rod ||8 is brazed to a movable' plunger |2| having a rubber seal |2|a which in turn is located within a tubular member |2|b headed over into the cap |03. The other end of the tubular member |2|b is screw-threaded into the casting I6 and is provided with a shoulder |22 to act as a support for a spider |22a supporting a spring |23, the other'end of which rests against the valve member 2| to normally seat the valve I9 against the valve seat I8 when permitted by the forward movement of the piston |88. V

In the modication'of the invention shown in Fig. 6, I have illustrated a mechanically operated part to be moved which may be connected, if desired, to a pipe such as the pipe 23, instead of the brake-band. For this purpose the pipe 23 may lead to a cylinder |24 having a chamber |24a therein adapted to be vented, when desired, by an air bleeder |26' constructed like the air bleeder The cylinder |24 support |28. Within the said cylinder |24 there is a piston |25 which is adapted to actuate a push rod |29 connected by a pivot |38 to a bell crank lever |3| mounted on any desired iixed pivot |32-and having an arm |33 normally pressed upwardly by a spring |34. The arm |33 may be used to operate any desired part to be moved.

In the modication of my invention shown in Fig. 7, the travel controlled features of my invention are applied to the operation of automotive lvehicle brake systems involving the use of compressed air. As shown in said gure I have provided a pedal |35 `carried by a iixed pivot |36 on the chassis of" an automobile (not shown). The pedal |35 is pivotally connected by a link |31 to an operating lever |38 mounted on a shaft |39 extending into a master cylinder |40, which may be of any desired construction, as for example the master cylinder as disclosed in the said Loughead patent. As shown in the drawings, for example, the master cylinder |40 may have the usual reservoir |4| and the usual iilling cap |42 as well as the usual vent |43. The shaft |39 which extends into .the master cylinder |40,l

. |66. It will be noted that thev `internal tubular valve member |13 has extending rearwardly therefrom a rod |84 which passes through the end of the valve member y|69 and is held in place thereon by a nut |85 which, by means of a washer |86, clamps in' place a leather gasket |81. A spring |88 rests against the said washer |86 and at the other end rests against the inside of a head |89 secured tothe valve casing |66. The head |89 'also has a vent |90.l The said head |89 and the plunger housing |52 can be secured to the valve casing |66 in any desired way. `The compressed air when admitted to the chamber |92 to an inlet port |93 in a forward' shell |94 furthermore, maybe provided with'ran operating lever |44 which bears on a piston |45 in a cylinder |46 provided with a piston |41 so placed that in the retracted position thereof it uncovers a compensating port |48. The said piston |41 is retracted by a spring |49. The liquid dischargedfrom the master cylinder |40 is supplied by a pipe |50 to an inlet port |5| which is located in a plunger housing' |52 having therein a chamber |53, The chamber |53 can be vented from time to time, as desired. through a passageway |54 leading to an air bleeder screw plug |55 constructed the same as and having the same parts associated therewith as in the case of the air bleeder screw plug 10 previously described herein. Within the chamber |53 there is a plunger |56 having a U-shaped rubber seal |51 carried in an annular recess |58 on the forward part of said plunger. The rear of said plunger |56 has an extension |59 which is arranged to move rearwardly avalve plunger |60 having a screw head 6| thereon holding in place a leather gasket |62. Between the extension |59 and the screw head |6| there is a space |63 which is vented to the outer air through a small port |64. The rear end of the valve plunger |60 has a ange |65 which extends over the end of the plunger housing |52 within a valve casing |66. The said valve housing |56 has an inlet port |61 which is adapted to be connected with any suitable source of compressed air. The compressed air thus admitted is received in an annular chamber. |68 on the periphery of a cylindrical valve member |69 located in a cylindrical chamber |10 in the valve casing |66 within which it is sealed by a leather gasket |1| which is located adjacent to a flange |12 on van internal tubular valve member |13 located within the valve member |69. The said internal tubular valve member |13 is, furthermore, provided with an annular valve element |14 which cooperates with a valve seat |15 on the valve plunger |60. Adjacent to the chamber |68 the valve member |69 has located thereon a tapered valve element |16 which cooperates with a valve seat |11 on the valve casing |66. When the conical Valve |16 is unseated the compressed air is then admitted to an annular cham-- ber |18 in the casing |66, which in turn admits the air through radial ports |19 in the valve member |69 to a cylindrical chamber |80 in the of a compressed air power unit |95. This supply of compressed air through the pipe |92 will" not take place, however; until after suiiicient pres; sure has been exerted through the pipe |50 so as to move the plunger |56, close the valve |14, |15 and open the valve |16, |11. Before the said valves are moved in this way, however, the man' ual hydraulic pressure will have passed initially from the chamber |53 through an outlet port |96 'andthence through a pipe |91 to an inlet port |98 on the forward Shell |94 of the 4power unit |95. The inlet port |98 communicates with a monitor chamber |99 having an air bleeder 200 constructed like the air bleeders previously described herein, and extending into the said cham ber there is a monitor plunger 20| which passes through an annularrubber seal 202,a washer 203,v adjacent to which there is a venting port 204, and then through a leather washer 205 held in place by a screw-threaded guiding sleeve 206 at the end of the chamber |99. The rear end of the monitor plunger 20| is flat and rests against a flexible diaphragm 201 of any desired material impervious to the air, as for example a 1ami nated oil-treated woven fabric, the said diaphragm being clamped at its periphery between the shell |94 and a rear shell 208 by means of carried on a piston rod 2| by being screw-threaded to a'recessed ring 2|2 attached to said head cylindrical valve member |69 in which chamber 2|0. 'A coil spring 2|3 requiring less force for its compression than the spring |88 rests at one end against the ring 2|2 and at the other end against the interior of the shell 208. The piston rod 2| passes out through a screw-threaded bushing 2|4 and thence through a liquid-tight packing 2|5 to the interior of a master cylinder 2|6 having a lling chamber 2 1 at the upper portion thereof lclosed by a lling cap 2|8 having a vent hole 2|9 therein. Below the chamber 2|1 there isa cylinder 220 carrying a piston 22| having a. recess 22'2 in which a rounded end 223 of the piston rod 2|| rests. The liquid put under pressure in the cylinder 220 passes out of the master cylinder through an outlet port 224 having a pipe 225 connected thereto which leads to the usual Wheel brake cylinders (not shown) located on the automobile chassis. i

In the modification of my invention shown in Fig. ,8, the. same general structure as described in connection with Fig. 'l is utilized, but instead of using a source of compressed air therein I use a source of vacuum. For this purpose, when using the vacuum I use exactly the same valve lar valve member |13 to a cylindrical chamber,v

mechanism as shown at the lower part of Fig. 7

and connections thereto, except in this instance .the inlet opening |61 is connected to the atmosout through an exhaust port las in the easing' 75 pheric air and the port' I 83 is connected by a pipe 226 to an' inlet port 221 on a rearl shell 228 of the vacuum power unit, as shown in Fig. 8, which also has an inlet port 229 leading by a pipe 230 to any suitable source of vacuum, as for instance the manifold of the internal combustion engine which operates the automobile on which the brake operating mechanism is mounted. All the remaining parts of the vacuum power unit are constructed the same as in the compressed air embodiment shown in Fig. 7, except when using the vacuum, instead of the pipe |91 leading from the port |96, a pipe 23| leading from said port to an inlet opening 232 which leads to the chamber |99 in the forward shell |94, which has an extension provided with a chamber 233 normally closed by a plug 234. However, in this instance a light spring 235 is provided, resting at one end thereof against the plug 234 and at the other end on a liquid compensating valve head 236 adapted to seat on a shoulder 231 within the said chamber 235. The valvehead 236 has a valve stem 238 which extends through an opening 239 and thence into a ybore in the plunger said bore being larger in diameter than said stem 238 and acting as a guide for the stem 238. Said extension of the forward shell |94 has a poril 240 which is connected by a pipe 24| to a port 242 on the discharge side of the master cylinder 229. Furthermore, in this instance the master cylinder is not provided with the reservoir 2|1l nor the filling cap 2I8, the Same being unnecessary in view of the pipe 24|.

In the operation of the apparatus, referring to` Figs. l to 5, the movement of the hand lever I to one side or the other will operate one or the other of the brake-bands 1 and 8, and as the operation of each of these brake-bands is the same, the operation of' only one thereof will be described in detail, for example the brake-band 8, and which may be located on the brake drum (not shown) of a winch used, for instance, in a hoisting engine and which may be driven by an internal combustion engine having a manifold from which vacuum is supplied to the apparatus by the pipe 44. The movement of the master cylinder piston Il will result in hydraulic liquid under preure passing through the pipe I3 and thence initially past the valve I8, I9 as the valve I8, I9 is normally withdrawn by the spring IIB due tothe valve being' h'eld back by the head I|9 against the force of the small spring |23. The liquid thus passes by the flutings 20 and thence out through the outlet port 22 'and the pipe 23 so as toact on the brake pistons .25 and 26, thus contracting the diameter of the brakeband 8 and, accordingly, applying the brake to the winch. By means of the mechanism made in accordance with my invention, however, not only is the desired modulated pressure applied to the brake pistons 25 and 2E but the travel thereof is coordinated to the travel of the hand lever I in the course of the further movement of the pistons 25 and -28 to apply the braking force to the extent desired to the brake drums (not shown). This is accomplished owing to the fact that as a further increase of manual pressure is applied tothe liquid passed through 'the pipe 38 and the pipe 54 to the plunger 58 simultaneously, the outlet valve 5I will be closed and the inlet valve 82 opened so as to admitair to the left face of the piston |08 and thus starting the movement of the same towards the right, in Fig. 3. This will be accomplished. at the same time by the movement of the plunger 63 in the chamber ,88 'so that the extent of travel of the piston III will be coordinated substantially exactly to the extent of travel of the hand lever I, while at the same time applying any desired degree of modulated pressure to the liquid, which is thus discharged by the closing of the valve I8, I9 and the forcing of the liquid trapped in the cylinder I2Ib out through the pipe 23 to the brake cylinder. In other words, the manual increase of pressure in the pipe 54 increases the pressure in the chamber 58. This results in moving the plunger 59 to the right and consequent closure of the-outlet valve 8| followed by opening to the desired degree the inlet valve y82. The air thus admitted through the latter valve exerts a pressure on the piston |98, ymoving it towards the right. This is accompanied by coordinate m0ve ment of the plunger 63 and increase in volume of the chamber 65, which is reflected in a coordinate movement permitted to the hand lever I which has been-moved to the desired forward position under manual pressure. However,4 at any one position in which the manual lever is held the degree of the pressure of the air admitted to the right of the diaphragm 80 will subsequent-` ly close the valve 82 as the consequent increase of pressure on the right of the diaphragm 81 will move the valve 82 slightly to the left, but additional pressure on the pistori can be applied thereto by slight additional pressure as desired on the manual lever I to again open and then close the valve 82 in the same way. 'I'he reverse movement of the parts will take place in a similar manner but in a reverse order` so that as a consequence not only an on-modulation but also an ofi-modulation may be secured at any time while at the same time the travel of the manual lever is coordinated to the extent of travel of the brake or other part moved thereby. It' will be noted, furthermore, that the power unit, which is comprised within the housing 39 and attached enclosures, is operable irrespective of its relative position in regard to the manual operating means and the part to be moved, for example the brake cylinder 24 and parts connected thereto, and that this is accomplished without thrust from the power unit on any support to which it may be connected. In fact, the support, as for instance the straps 45, 4l, may be omitted. This enables the apparatus to be set up more quickly as the power unit' may be located at any convenient point during the operation of the apparatus.

The operation of the modification shown in Fig. 6 is the same except that this is shown as a cylinder with a single piston, having a bell crank lever connected to the part to be moved and the travel of' which and the pressure on which can be simultaneously controlled effectively at all times. I

In the operation of the modied form of my invention shown in Fig. 7the .apparatus disclosed therein is designed for the operationof compressed airbrakes applied to any desired type of automotive vehicle. In fact this apparatus is also designed so that it may be applied in the operation of present forms of air brake systems carried by automobiles. In the apparatus shown in this figure the. manually supplied hydraulic liquid received from the master cylinder enters the port |5| and thence passes into the cylinder `|99 having the monitor plunger 20| therein,

by the movement of which the brakes may be manually applied by moving the plunger 2|I. master cylinder piston 22I and, accordingly, the hydraulic liquid supplied through the port 224 passes to the brake cylinders for operating the brakes manually. Due to the monitor plunger 20| the travel of'the brakes will be coordinated to the travel ofthe foot pedal supplying the liquid under manual pressure to the port The manual supply liquid received in the port |5| will -close the valve |14, |15 the initial closure of which does not prevent the subsequent application of power Aby the diaphragm 201 as the further increase of the manual pressure will result in unseating the inlet valve |16 against the opposition of the spring |88, thereby permitting air pressure from the port |61 to` pass by the ports |19 out through the port |9I in the formv of modulated increments of air pressureso as to move the diaphragm 201, the plunger being maintained in contact therewith, and consequently the master cylinder piston 22| so aS to apply the hydraulic pressure through the pipe 225 to the brake cylinders for applying the brakes. Accumulating pressure in the chamber |18 will close the inlet valve v|16 when the movement of the piston |41 stops at-any given point and thereafter partial or entire release of the manual pressure exertedl by the pedal |35 on the liquid supplied to the port |5| will cause the valve |14, |15

to become unseated, thus exhausting the air' through the exhaust port |83 and causing the diaphragm 201 to move to the left so as to release the brakes.

In the modification of my inventionshown in Fig. 8, the apparatus is designed to be applied to the hydraulic operation of vacuum-operated brake systems, and in fact is applicable to the operation of vacuum brake systems customarily in use on automobiles. This modification of my invention operates similarly to the compressed air-operated embodiment shown in Fig. 7. However, in this instance the port |61 being a vent and the port |33 being a vacuum connection leading to the right side of the diaphragm 201, the portv |9| admits modulated amounts of atmospheric air pressure fromthe pipe |92 to the `left side of the'diaphragm 201 according to how thro'ugh the port |93 on the diaphragm 201, with y the resultant movement of the plunger 20| to the right, which remains in contact with 'the diaphragm 201, the valve head 236 becomes seated so as to cut off further-access of the liquid from the pipe 23| to the chamber 233- and thereafter the manual pressure received through the pipe 23| will act merely to move the plunger 20| to` keep it in contact with the diaphragm 201, while the atmospheric air pressure'on the diaphragm 201 acts to convey the pressure to the pipe 2 25 leading to the brakes. However, relaxation of.

f said manual pressure through the pipe 23| will again result in the valve head 236 being forced off its seat by the retraction of the monitor plunger 20| under the influence of the spring 2|3 thus releasing the brakes.

While I have described my invention above in detail I wish'it 4to be understood that many changes' may be made therein without departing from the spirit of the same.

I claim:

1. In an apparatus of the character described, an enclosedwall adapted to bejmoved by a gaseousV medium, a plunger and a cylinder connected thereto, a work-performing part adapted to be movedthereby, a control means therefor, a valve apparatus having a pressure responsive means controlled by said means adapted to confirst mentioned plunger, connected to the movable wall, constructed to have movement with said wall and constructed so as to coordinate the movement of the wall and control means and to operate as a resultI of the movement of said valve apparatus.

2. In an apparatus of the character described, an lenclosed wall adapted to be moved therein, a` work-performing part adapted to be moved thereby, a control means therefor, a valve apparatus having a pressure responsive means controlled by said means adaptedto control the movement of said 'wall in one direction, and means for urging said wall in the opposite direction,` said control means comprising a master cylinder, a hydraulic conduit leading therefrom directly to said part conveying liquid under pressure to actuate the latter, and a fluid controlling device, including a cylinder in communication with the pressure-responsive device andhaving a conduit leading to the master cylinder and plunger'means therein on the other siderof the wall from the hereinafter mentioned pressure increasing plunger, connected to the movable wall, constructed to have movement with said wall and constructed so as to coordinate .the movement of the wall and control means and to operate as a result of the movement of said valve apparatus, said Wall having a pressure-increasing plunger connected thereto, provided with a second separate different cylinder.

3. In an apparatus of the character described, an enclosed wall adapted to be moved therein, a source of pressure for moving the same, a part for performing work moved thereby, a control means, constructed so as to coordinate the movement of the wall and control means, said wall having a pressure-increasing plunger connected thereto and a cylinder therefor, said device comprising a cylinder for said first mentioned plunger and said valve apparatus comprising a valveactuating plunger in the last mentioned cylinder for bringing about the movement of said movable wall by said source of pressure.

4. In an apparatus of the character described, an enclosed wall adapted to be moved therein, a work-performing part adapted to be moved thereby, a control means therefor, a valve apparatus controlled by said means, constructed to control the movement of said wall in one direction, and means for urging said wall in the opposite direction, said control means comprising a master cylinder, a hydraulic conduit therefrom to said part, constructed so as to convey pressure t actuate the latter, and a uid controlling device connected to the movable wall and having in communication therewith a conduit leading to the master cylinder, constructed so as to coordinate the movement of the wall and control means, said device comprising aplunger'and a cylinder for the plunger, and said control means further comprising an annular plunger connected to said valve apparatus located around the plunger ci" said device.

5. In an apparatus of the character described, an enclosed wall adapted'to be moved therein, a work-performing part adapted to be moved thereby,a control means therefor, a valve apparatus controlled by said means adapted to control the movement of said wall in one direction, and means for urging said wall in the opposite direction, said control means comprising a master cylinder, a hydraulic conduit therefrom to said part, constructed to convey pressure to actuate the latter, and a fluid controlling device connected to the movable wall and having a conduit leading to the master cylinder, constructed so as to coordinate the movement of the wall and control means, said wall having a pressure-increasing device connected moving said wall, a valve operatively connected to the wall constructed when open to initially apply by the manually operable means manual hydraulic pressure to said part and when closed to interrupt said application of the manual hydraulic pressure, a valve apparatus controlled by said manual means constructed to control the movement; of said Wall in one direction, means f or urging said wall inthe opposite direction, and a fluid controlling device having two f plungers, one connected to the movable wall to be moved thereby and the other connected to the y valve apparatus to operate said apparatus and thereto, said device comprising a plunger and a cylinder for the plunger, and said control means further comprising an annular plunger connected to said valve apparatus located around the plunger of said device.

G. In an apparatus of the character described, an enclosed wall adapted to be moved therein, a part adapted to be operated hydraulically by the movement of said wall, a manually operable hyy draulic control means for moving said wall, in-

vcluding a master cylinder, a hydraulic conduit therefrom to said part, conveying liquid under pressure to actuate the latter, a valve apparatus having a pressure-responsive means controlled by said manual means adapted to control the movement of said wall in one direction, means for urging said wall in the opposite direction, and a fluid controlling device including a cylinder in communication with the pressure responsive device and having a conduit leading to the master cylinder and plunger means therein on the other side of the Wall from the hereinafter mentioned pressure-increasing plunger,

' connected to the movable wall, constructed to including a cylinder connected by a passageway to said control means constructed so as to coordinate the movement of the wall and control means, said wall having a pressure-increasing plunger provided with another separate different cylinder attached 'to the plunger of said device which is connected to the movable wall and having a lost-motion connection with said valve.

8. In combination, a master cylinder, a part adapted to be moved by the liquid from the master cylinder for work-performing action, and a power unit connected to the master cylinder, said power unit having a source of vacuum, a conduit connection from the master cylinder conveying operating liquid to move said part directly from the master cylinder without the power from the power unit, a plunger having a hydraulic connection to said part adapted to be operated by the vacuum for applying power hydraulically from the plunger to said part, a cylinder for said plunger, a valve means, having a pressure-responsive means, operated from the master cylinder for controlling the application of said vacuum, a wall adapted to be moved under the influence of said vacuum controlled by the valve means, and a second separate different plunger cylinder having movable means therein on the other side of the wall from the rst mentioned plunger, said movable means being mechanically connected to the wall so as to move as a result of the movement of said valve and to move substantially in accordance with said first-mentioned plunger and movable wall a communication between the pressure-responsive means and the second plunger cylinder, saidmovable means being adapted to be operated from the master cylinder by control of the operation of the movable wall.`

9. In combination. a master cylinder, a part adapted to be moved by the liquid from the master cylinder for work-performing action, and a power unit connected to the master cylinder, said power unit having a sourceof vacuum, a conduit connection from the power unit for operating said part directly from the master cylinder without the power from the power unit, a plunger adapted to be operated by the vacuum for applying power for the movement of said part, a cylinder for said plunger, a valve means operated from the master cylinder for controlling the application of said vacuum, a wall adapted to be moved under the inuence o! said vacuum controlled by the valve means, a. second plunger, provided with a cylinder, connected to said rstmentioned plunger and movable wall adapted to be operated as a, result of the operation of the master cylinder for control of the operation' of the movable wall, and an annular plunger, provided with a cylinder, operated hydraulically' from the master cylinder located around the to be operated .by

second-mentioned plunger for controllingthe operation of said valve means.

10., In combination, a master cylinder, apart said power unit havingV a source of vacuum, a,

conduit connection from the master cylinder conveying operating liquid to move said part directly from the `'master cylinder without .the power from the power unit, a plunger havinga hydraulic connection to said part adapted tobe operated by the vacuum for applying power hydraulically from the plunger to said part, a cylinder for said plunger, a valve means, having a pressure-responsive means, operated from the master cylinder for controlling the application of said vacuum, a wall adapted to be moved under the influence of said vacuum controlled bythe valve means, a second separate different plunger cylinder having movable means therein on the other side of the wall from the rst mentioned plunger, said movable means being mechanically connected tothe Wall so as to move as a result of the movement of said valve and to move substantially in accordance with said first-mentioned plunger and movable wall a com- Amunication between the pressure-responsive means and the second plunger cylinder, said movable means being adapted to be Operated from the master cylinder by control of the operation of the movable wall, and a hydraulic valve connected to said rst-mentioned plunger and adapted to disconnect the delivery from the master cylinder to said part when the rst-mentioned plunger has moved into action.

11. In combination, a master cylinder, a part adapted to be moved by the liquid from the' master cylinder for work-performing action, and a power unit connected to the master cylinder,

vsaid power unit having .a source of vacuum, a

conduit connection from the power unit for operating said part directly from the master cylinder without the power from the power'unit, a

plunger adapted to be operated by the vacuum for applying power for the movement of said part. a cylinder for said plunger, a valve means operated from the master cylinder for controlling the application of said vacuum, a wall adapted to be moved under the influence of said vacuum controlled by the valve means, a second plunger, provided with a cylinder, connected to'said rstmentioned plunger and movable wall adapted to be operated as a result of the operation of the master cylinder for control of the operation of the movable wall, an annular plunger, provided with a cylinder operated hydraulically from the master cylinder located around the secondmentioned plunger for controlling the operation of said valve means, and a hydraulic valve connected to said first-mentioned plunger and adapted to disconnect the delivery from the master cylinder to said part when the lrst mentioned plunger has moved into action. r

' 12. In combination, a master cylinder, a part adapted to be moved by the liquid from the master cylinder for work-performing action, and

conveying operating liquid to move said part directlyl from the master cylinder without the power from the power'unit, a plunger adapted for the movement of saidpart, a cylinder for the vacuum for applying power said plunger, a valve means operated from the master cylinder -for controlling the application of said vacuum, a wall, in a cylinder, adapted to be moved under the influencev of said vacuum controlled by the valve means, and a second plunger cylinder havingl movable means therein, said' movable means being mechanically connected to the wall so as to move as a result of the movement of said valve and to movesub- -stantially in accordance withsaid first-mentioned Aplunger and ,movable wall, said movable means being adapted to be operated from the `master cylinder by control of the operation of the movable wall, said power unit comprisingl also an enclosure, for the movable wall and its cylinder, containing the said vacuum and a cylindrical extension chamber lattachedto said enclosure and forming the second plunger cylinder in which said second-mentioned plunger opconduit connection from the power unit for operating said part directly from the master cylinder without the power from the power unit, a plunger adapted to be operated bythe vacuum for/applying power for the movement of said part,

a cylinder for said plunger, a valve means operated from the master cylinder for controlling the application of said vacuum, a wall adapted to be moved `under the influence of said vacuum controlled by the valve means, a second plunger. provided with a cylinder, connected to said firstmentioned plunger and movable wall adapted to be operated as a result; of the operation of the master cylinder for control of ,the operation of the movable wall, and an annular plunger, provided with a cylinder, operated hydraulically from the master cylinder located' around the second-mentioned plunger for controlling the op- .eration ofy said valve means, said powerunit comprising also an enclosure, for the first-mentionedcylinder and movable wall, containing the said vacuum and a cylindrical extension chamber attached to said enclosure in which said secondmentioned plunger operates.

14. In combination, a master cylinder, a part adapted'to be moved by the liquid from the master cylinder for work-performing action, and a power unit connected 'to said power unit having a source of vacuum, a conduit connection from master cylinder conveying operating liquid to move said part directly from' the'master cylinder without the power from the power unit, a plunger adapted to be operated by the vacuum for applying power for the movement of said part, a cylinder for said plunger, a valve means operated from the master cylinder for controlling the application of said vacuum. a wall, in a cylinder, adapted to be moved under the influence of said vacuum controlled by the lvalve means, a second plunger cylinder having movable means therein, said .movable means being mechanically connected,

to the wall so as to move as a result of the movement of said valve and to move substantially in accordance with -said first-mentioned plunger and movable wall, and -a hydraulic valve connected to said first-mentioned plunger and adapted to disconnect the delivery from the master cylinder, to said part when the first-mentioned plunger has moved into action, said power the maste'r cylinder,

unit comprising also an enclosure, for the movable wall and its cylinder, containing the said vacuum and a cylindrical extension chamber attached to said enclosure and forming the second plungercylinder in which said second-mentioned plunger operates.

15. In combination, a master cylinder, a part adapted to be moved by the liquid from the master cylinder for work-performing action, and a powerunit connected to the master cylinder, said power unit having a source of vacuum, a conduit connection from the power unit for operating said part directly from the master cylinder without the power from the power unit, a plunger adapted to be operated by the vacuum for applying power for the movement of said part, a cylinder for said plunger, a valve means operated from the master cylinder for controlling theapplication of said vacuum, a. wall adapted to be moved under the inifluence of said vacuum controlled by the valve means, a second plunger, provided with a cylinder, connected to said rstmentioned plunger and movable wall adapted to be operated as a result of the operation Vof the masten cylinder for control of the operation of the movable wall, an annular plunger, provided with a cylinder, operated hydraulically from the master cylinder located around the second-mentioned vplunger for controlling the operation of said valve means, and a hydraulic valve -connected to said first-mentioned plunger and adapted to disconnect the delivery from the master cylinder to said part when the rst mentioned' plunger has moved into action, said power unit comprising also an enclosure, for the rstmentioned cylinder and movable wall, containing the said vacuum and a cylindrical extension chamber attachedv to said enclosure in which said second-mentioned plunger operates.

16. In an apparatus of the character described, an enclosed wall adapted to be moved by a gaseous medium, a work-performing part adapted to be moved thereby, a hydraulic control means therefor, a valve apparatus having a pressureresponsive means, including a source of vacuum, an outlet valve and: an air inlet valve, controlled by said means adapted to control the movement,

of said wall in one direction, and means for urging said wall in the opposite direction, said control means comprising a master cylinder, aA

hydraulic conduit leading therefrom to actuate said part, constructed to convey pressure to actuate the latter, and a fluid controlling plunger connected to the movable Wall, constructed to have movement with said wall and a cylinder for 'said plunger having a fluid connection to said pressure-responsivemeans and with the control means to coordinate the movement of the wall and control means, said plunger, passing through one of said valves.

1'7. In an apparatus of the character described, an enclosed wall adapted to be moved by a gaseous medium, a Dart having `=liquid compensating said wall in one direction, and means for urging said wall in the opposite direction, said control means comprising a master cylinder, a hydraulic conduit leading therefrom to actuate said part,

constructed to convey pressure to actuate the latter, and a fluid controlling plunger connected to the movable wall and a cylinder for said plunger having a uid connection to said pressure-responsive means and the control means, constructed so as to coordinate the movement of the wall and control means, said plunger passing through both of said valves.

18. In an apparatus of the character described, an enclosed wall adapted to be moved by a gaseous medium, a work-performing part adapted to be moved thereby, a hydraulic control means therefor, a valve apparatus having a pressure# responsive means, including a source of vacuum, an outlet valve and an air inlet valve, controlled by said means, constructed to control the movement of said wall in one direction, and means for urging said wall in the opposite direction, said control means comprising a master cylinder, a hydraulic conduit therefrom to said part, constructed to convey pressure to actuate the latter, and a fluid controlling plunger connected tothe movable Wall and a cylinder for said plunger having a fluid connection to said pressure-responsive means and the control means, constructed so as to coordinate the movement of the Wall and control means, said plunger passing through one of said valves, said Wall having a pressure increasing plunger connected thereto and to said first mentioned plunger.

19. In an apparatus of the character described, an enclosed wall adapted to be moved by a gaseous medium, a part having liquid conmpensating hydraulic connections adapted to be moved by said wall, a hydraulic control means therefrom, a valve apparatus, including a source of vacuum, an outlet valve and an air inlet valve, controlled by said means, constructed to control the movement of said wall in one direction, and means for urging said wall irithe opposite direction, said control means comprising a master cylinder, a hydraulic conduit therefrom to said part, constructed to convey pressure to actuate the latter, and a fluid controlling plunger connected to the movable wall and a cylinder for said plunger having a uid connection to said pressure-responsive means and the control means, constructed so as to coordinate the movement of the wall and control means said plunger passing through both of said valves, said wall having a pressure-increasing plunger connected thereto and to said first mentioned plunger.

. Q EDWARD A. ROCKWELL. 

